<template>
  <div id="app">
    <div id="nav">
      <router-link to="/">Home</router-link> |
      <router-link to="/about">About</router-link>
    </div>
    
    <!-- include  想缓存谁 -->
    <!-- exclude  不想缓存谁 -->
    <keep-alive :include="['about']">
      <router-view />
    </keep-alive>


    <!-- <keep-alive v-if="$route.meta.keep">
      <router-view />
    </keep-alive>

    <div v-else>
      2222
      <router-view />
    </div> -->
  </div>
</template>

<script>
export default {
  created() {
    // console.log(this.$route);
  },
};
</script>


<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}

#nav {
  padding: 30px;
}

#nav a {
  font-weight: bold;
  color: #2c3e50;
}

#nav a.router-link-exact-active {
  color: #42b983;
}
</style>
